CN201796428U

CN201796428U - Single-phase cost control intelligent electric energy meter with temperature compensation clock module

Info

Publication number: CN201796428U
Application number: CN2010205456910U
Authority: CN
Inventors: 李中泽
Original assignee: WUHAN SHENGFAN ELECTRONICS STOCK CO Ltd
Current assignee: WUHAN SHENGFAN ELECTRONICS STOCK CO Ltd
Priority date: 2010-09-28
Filing date: 2010-09-28
Publication date: 2011-04-13
Anticipated expiration: 2020-09-28

Abstract

The utility model relates to a single-phase cost control electric energy meter and provides a single-phase cost control intelligent electric energy meter with a temperature compensation clock module. The single-phase cost control intelligent electric energy meter with the temperature compensation clock module comprises a singlechip central processing unit, wherein the singlechip central processing unit is connected with an electric energy basic function module and a clock module circuit. In the utility model, the clock module accomplishes temperature measurement and clock output, clock compensation is carried out by the singlechip central processing unit, and an imported clock chip is replaced by a clock module circuit and singlechip program combined high-precision clock, so that the cost of the intelligent electric energy meter is reduced. Meanwhile, in comparison with a clock mode that soft clock is computed by adopting the singlechip, the clock precision is guaranteed when temperature changes.

Description

The single-phase control intelligent electric energy meter that takes of band temperature compensated clock module

Technical field

The utility model relates to a kind of single-phase expense control electric energy meter, particularly a kind of single-phase expense control intelligent electric energy meter that has the temperature compensated clock module.

Background technology

In recent years, intelligent electric energy meter develops rapidly, the existing trend that substitutes common electric energy meter.In intelligent electric energy meter, functions such as many rates function, calendar all need to use clock, and clock is the indispensable part of intelligent electric meter.Because intelligent electric energy meter is had relatively high expectations to the degree of accuracy of clock, the intelligence table has all used the clock chip of import mostly, and cost is higher, and is unfavorable for the development of domestic own clock technology.So need to seek a kind of circuit that can the import substitution clock chip, both guaranteed clock accuracy, reduce cost again.

Summary of the invention

The purpose of this utility model is in order to overcome above-mentioned the deficiencies in the prior art, a kind of single-phase expense control intelligent electric energy meter that has the temperature compensated clock module to be provided, can realize high accuracy clock output, can reducing cost again.

To achieve these goals, the single-phase control intelligent electric energy meter that takes of the utility model band temperature compensated clock module comprises the single-chip microcomputer CPU (central processing unit) that links to each other with the electric energy meter basic function module, and described single-chip microcomputer CPU (central processing unit) links to each other with the clock module circuit.

In technique scheme, adopt clock chip IC1 in the described clock module circuit, its model is BL5372,8 pin of this chip meet power vd D and pass through capacitor C 1 ground connection, 6 of clock chip IC1,7 pin connect by crystal X2, capacitor C 2, the oscillatory circuit that capacitor C 3 is formed, 2 of clock chip IC1,3 pin connect the clock mouth and the data port of single-chip microcomputer CPU (central processing unit) respectively, 4 pin ground connection, the 5th pin of clock chip IC1 is the pulse per second (PPS) delivery outlet, the port revf of single-chip microcomputer CPU (central processing unit) connects reference voltage, the temperature sensing circuit that the AD termination precision resistance R1 of single-chip microcomputer CPU (central processing unit) and thermistor RT2 form, the P1 end of single-chip microcomputer CPU (central processing unit) is by wire jumper JP1, the output terminal that JP2 selects both to have can be used as reference voltage also can be used as the input end of clock signal, the P1 end is the output terminal of reference voltage when connecting JP1, when connecting JP2, the P1 end is clock signal input terminal.

The utility model is finished temperature survey and clock output by clock module, carry out clock compensation by the single-chip microcomputer CPU (central processing unit), its beneficial effect is: adopt the clock chip of the high precision clock import substitution of clock module circuit and Single Chip Microcomputer (SCM) program cooperation, reduce the intelligent electric energy meter cost.Simultaneously, with respect to adopting the clock mode that calculates soft clock by single-chip microcomputer, the clock accuracy in the time of can guaranteeing temperature variation.The modular design of clock circuit is convenient installs, compatible good, and the accuracy height helps promoting popularizing of intelligent electric energy meter.

Description of drawings

Fig. 1 is a circuit diagram of the present utility model.

Embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

A kind of single-phase control intelligent electric energy meter that takes as shown in Figure 1 with the temperature compensated clock module, it comprises the clock module circuit, the single-chip microcomputer CPU (central processing unit) that links to each other with the electric energy meter basic function module, adopt clock chip IC1 in the described clock module circuit, its model is BL5372,8 pin of this chip meet power vd D and pass through capacitor C 1 ground connection, the 6th of clock chip IC1,7 pin connect by crystal X2, capacitor C 2, the oscillatory circuit that capacitor C 3 is formed, the value of adjusting capacitor C 2 ~ C3 can be adjusted the oscillation frequency of crystal, thereby adjust the frequency of clock, guarantee timekeeping performance at normal temperatures.2,3 pin of clock chip IC1 connect the clock mouth and the data port of single-chip microcomputer CPU (central processing unit) respectively, 4 pin ground connection.The 5th pin of clock chip IC1 is the pulse per second (PPS) delivery outlet.The port revf of single-chip microcomputer CPU (central processing unit) connects reference voltage, the temperature sensing circuit that the AD termination precision resistance R1 of single-chip microcomputer CPU (central processing unit) and thermistor RT2 form, the single-chip microcomputer CPU (central processing unit) is carried out real-time temperature compensation according to the value that temperature sensing circuit records to clock module.The output terminal that the P1 of single-chip microcomputer CPU (central processing unit) end selects both to have can be used as reference voltage by wire jumper JP1, JP2 also can be used as the input end of clock signal, the P1 end is the output terminal of reference voltage when connecting JP1, when connecting JP2, the P1 end is the 32.768KHZ clock signal input terminal.

When environment temperature changed, the oscillation frequency of crystal also can change, and clock accuracy is departed from.The single-chip microcomputer CPU (central processing unit) is by the temperature sensor measurement environment temperature in the clock module, with the data contrast that is stored in the single-chip microcomputer CPU (central processing unit) in advance, judge the temperature deviation of this moment, carry out temperature compensation again, utilize and adjust the variation that circuit can change the step-by-step counting in current 1 second in per 20 seconds digit time, thereby adjust when reaching clock and walking, when making clock chip keep high precision clock to walk.

Claims

1. the single-phase control intelligent electric energy meter that takes of band temperature compensated clock module comprises the single-chip microcomputer CPU (central processing unit) that links to each other with the electric energy meter basic function module, and it is characterized in that: described single-chip microcomputer CPU (central processing unit) links to each other with the clock module circuit.

2. the single-phase control intelligent electric energy meter that takes of band temperature compensated clock module according to claim 1, it is characterized in that: adopt clock chip IC1 in the described clock module circuit, its model is BL5372,8 pin of this chip meet power vd D and pass through capacitor C 1 ground connection, 6 of clock chip IC1,7 pin connect by crystal X2, capacitor C 2, the oscillatory circuit that capacitor C 3 is formed, 2 of clock chip IC1,3 pin connect the clock mouth and the data port of single-chip microcomputer CPU (central processing unit) respectively, 4 pin ground connection, the 5th pin of clock chip IC1 is the pulse per second (PPS) delivery outlet, the port revf of single-chip microcomputer CPU (central processing unit) connects reference voltage, the temperature sensing circuit that the AD termination precision resistance R1 of single-chip microcomputer CPU (central processing unit) and thermistor RT2 form, the P1 end of single-chip microcomputer CPU (central processing unit) is by wire jumper JP1, the output terminal that JP2 selects both to have can be used as reference voltage also can be used as the input end of clock signal, the P1 end is the output terminal of reference voltage when connecting JP1, when connecting JP2, the P1 end is clock signal input terminal.